Vulnerability · Published Aug 25, 2026 · Assigned by GitHub_M

CVE-2026-55532PraisonAI: Origin-validation bypass (startswith prefix match) enables unauthenticated cross-site request forgery against the PraisonAI MCP HTTP server

High 7.6

In plain English

A high-severity cross-site request forgery in PraisonAI from MervinPraison. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)0.2%top 90.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, MCP HTTP Stream _validate_origin uses request_origin.startswith(allowed), allowing the attacker-controlled localhost.attacker.com HTTP origin to satisfy the localhost allowlist. A webpage can send Content-Type: text/plain requests without preflight and invoke tools/call without an API key, including file writes that persist agent instructions. This issue is fixed in version 4.6.58.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	praisonai	4.6.58	GHSA-pvph-5j39-v8qc
PyPI	praisonai	4.6.58	PYSEC-2026-3892

Affected products (as reported)

Vendor	Product	Versions
MervinPraison	PraisonAI	< 4.6.58

Weakness: CWE-346, CWE-352 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-pvph-5j39-v8qc x_refsource_CONFIRM
https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1 x_refsource_MISC
https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58 x_refsource_MISC